Synthesis,Characterization And Performance Investigation Of Hydrophobic Graphene Oxide

From 2004,Graphene have attracted substantial attentions in various area owing to its unique structure and extraordinary properties.As the oxidation of graphene,graphene oxide(GO)could be functionalized through the hydroxyl,carboxyl and epoxy groups on the GO sheets.There were many reports of functional graphene oxide,especially focused on the hydrophilic modifications.However,reports on hydrophobic GO modification were still very rare.In this dissertation,a series of modifications of graphene oxide were carried out to improve the hydrophobic properties of GO,and also the potential applications in different fields were explored.(1)A hydrophobic GO derivative was prepared by simply reacting GO with linear dodecyl isocyanate.In order to verify the structure of modified GO,multiple characterization methods including FTIR,XPS,XRD,TEM and AFM were performed and the results suggested that the linear alky chains have successfully grafted onto the GO layers where the hydroxyl and carboxyl of GO were distributed.Compared with pristine GO,the modified hydrophobic GO were confirmed its remarkable hydrophobility.(2)An original method of chemoembolization based on a novel hydrophobic graphene oxide(GO)as the drug vehicle was comprehensively proved in the current study.Firstly,the composition and microstructure of the hydrophobic graphene oxide were confirmed by a series of characterization methods such as FTIR,XRD,TGA,XPS,EDX,STEM and AFM.It was found that the as prepared hydrophobic GO dispersed in Lipiodol stably for at least over an entire week.While the hydrophobic GO showed excellent delivery performance as a drug carrier with the doxorubicin(DOX)loading content of 53%.Furthermore,in vivo investigation using VX2 rabbit as model animal are in progress,the current results indicated that the hydrophobic graphene oxide could be transported into tumor tissue successfully by Lipiodol in TACE.(3)By combining a trifunctional urethane acrylate synthesized from Wannate HT-100 and Komerc-C021 with a bifunctional urethane acrylate prepared from hydroxyethyl acrylate and isophorone diisocyanate,a new reactive resin mixture was prepared,and trimethylolpropane triacrylate was chosen as the thinner to constitute a novel coating matrix.Different amounts of multi-functionalized carbon nanotubes(CNTs)and graphene oxide(GO)were introduced into the matrix and cured by ultraviolet radiation,producing the different coatings.Utilizing the methods of FT-IR,UV-vis and WAXD,the chemical structures and physical properties of the coatings were analyzed.A series of ASTM methods,such as pencil hardness classification,RCA abrasion,crosscut adhesion test classification,and chemical resistance rub testing,were applied to investigate the performances of the coatings.It was found that introducing a small amount of carbon nanomaterials can improve the thermal stability,surface hardness,adhesion,abrasive resistance,and chemical resistance performance of the UV-curable coatings.The reasons and mechanisms of the performance improvements are discussed in this work.